/Engine/Plugins/MeshPainting/Source/MeshPaintingToolset/Public/MeshPaintGeometryCollectionAdapter.h
Get the underlyingUGeometryCollectionfrom the component, as a non-const object Caller must have already validated that the component weak pointer is still valid (as this is called per-vertex)
[UGeometryCollection](API\Runtime\GeometryCollectionEngine\GeometryCollection\UGeometryCollection) * GetGeometryCollectionObject() const